Dr. Jonathan Keffer , MD
General Practice • Ithaca, NY
110 Ho Plz
Ithaca, NY 148533102
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Jonathan Keffer is listed in NPPES under General Practice.
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NPI assigned on August 18, 2006; this date does not establish years in practice.
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Published CMS data list 125 Original Medicare Part B services in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Published rows only; this is not a quality measure.
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Published Part B service records, 2022:
- 87426 — Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus: 61 service units.
- 99213 — Established patient outpatient office visit: 40 service units.
- 99212 — Established patient outpatient office visit: 24 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2021 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2022). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 11 Medicare Part D prescriptions, including refills, in 2020.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Published rows only; this is not a quality measure.
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Published Part D records, 2020:
- Cefdinir — 11 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 193 in 2018 to 125 in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018–2022.
Practice Location & Contact Primary Location
110 Ho Plz
Ithaca, NY 148533102
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
General Practice: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $7,893 in 2022
The total amount Medicare approved for these services in 2022. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022.
Paid by Medicare
About $7,245 in 2022
The part of the Medicare-allowed amount that Medicare itself paid in 2022, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022.
30-day fills
11 standardized 30-day fills in 2020
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$118 in 2020
The total cost of these prescriptions in 2020, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $17.38 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Ithaca and New York
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Keffer are from 2022.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Keffer are from 2020.
1 active clinicians are listed under General Practice with a practice address in Ithaca, NY (682 in New York).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 35% from 193 in 2018 to 125 in 2022.
- 2018: 193
- 2019: 233
- 2020: 368
- 2021: 239
- 2022: 125
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Medicare-allowed amount
Medicare-allowed amount decreased 48% from $15,161 in 2018 to $7,893 in 2022.
- 2018: $15,161
- 2019: $18,893
- 2020: $22,876
- 2021: $20,570
- 2022: $7,893
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Paid by Medicare
Paid by Medicare decreased 37% from $11,553 in 2018 to $7,245 in 2022.
- 2018: $11,553
- 2019: $12,777
- 2020: $20,344
- 2021: $19,542
- 2022: $7,245
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 86% from 76 in 2015 to 11 in 2020.
- 2015: 76
- 2016: 123
- 2017: 56
- 2019: 23
- 2020: 11
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30-day fills
30-day fills decreased 86% from 76 in 2015 to 11 in 2020.
- 2015: 76
- 2016: 123
- 2017: 56
- 2019: 23
- 2020: 11
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Part D drug cost
Part D drug cost went from $601 in 2015 to $118 in 2020.
- 2015: $601
- 2016: $1,360
- 2017: $409
- 2019: $228
- 2020: $118
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $17.77 in 2020 to $17.38 in 2025.
- 2020: $17.77
- 2023: $19.41
- 2024: $34.25
- 2025: $17.38
Sources: CMS Medicare Physician & Other Practitioners (2022), CMS Medicare Part D Prescribers (2020), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $17.38.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Penumbra, Inc. |
Food and Beverage
Cash or cash equivalent
|
RUBY Coil | General | $17.38 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2021 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2022; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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87426
Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus
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61 | 61 | $98.36 | $34.32 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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40 | 40 | $208.80 | $104.54 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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24 | 24 | $123.00 | $67.43 |
Source: CMS Part B by Provider and Service, 2022; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2020.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Cefdinir | Cefdinir | 11 | 77 | $117.55 | 11 |
Source: CMS Part D by Provider and Drug, 2020; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-08-31NUCC Taxonomy Code: 208D00000X
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Nurse Practitioner
Family Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Nurse Practitioner
Psychologist
Doctor of Philosophy (Ph.D.)
Social Worker - Clinical
Licensed Clinical Social Worker - Registered
Nurse Practitioner
Master of Science in Nursing, Advanced Practice Registered Nurse, Family Nurse Practitioner (Certified)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 110 HO PLZ, ITHACA, NY 148533102 (Tel: 6072555155)
Registered at 110 HO PLZ, ITHACA, NY 148533102 (Tel: 6072555155)
Registered at 1081 KRAFT RD, ITHACA, NY 148509575 (Tel: 9176975068)
Registered at 1081 KRAFT RD, ITHACA, NY 148509575 (Tel: 9176975068)
Recorded as JONATHAN KEFFER, MD
NPI status registered as active in NPPES database
Registered at 280 HENRY ST, NEW YORK, NY 100024816 (Tel: 2122278401)
Registered at 280 HENRY ST, NEW YORK, NY 100024816 (Tel: 2122278401)
Recorded as JONATHAN WEINSTEIN, MD
General Practice (license number reported to NPPES: NY 228331)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
110 Ho Plz
Ithaca, NY 148533102
Phone: 6072555155